Fix "Uncaught ValueError: Path cannot be empty ..." in com_joomlaupdate restore.php

[richard67]

Pull Request for Issue #31308 .

Summary of Changes

Adds a check if the path is empty.

Testing Instructions

See issue #31308 .

To reproduce, update e.g. a 3.9.22 to 3.9.23 RC.

To test the fix of this PR, update e.g. a 3.9.22 to the update package built by Drone for this PR.

Verify that the update has run completely by checking the Joomla Update log file administrator/logs/joomla_update.php. The following logs should be there:

2020-11-20T18:39:21+00:00       INFO 192.168.98.1       update  Update started by user Super User (342). Old version is 3.9.22.
2020-11-20T18:39:21+00:00       INFO 192.168.98.1       update  Downloading update file from https://ci.joomla.org/artifacts/joomla/joomla-cms/staging/31442/downloads/37665/Joomla_3.9.23-rc+pr.31442-Release_Candidate-Update_Package.zip.
2020-11-20T18:39:22+00:00       INFO 192.168.98.1       update  File Joomla_3.9.23-rc+pr.31442-Release_Candidate-Update_Package.zip downloaded.
2020-11-20T18:39:22+00:00       INFO 192.168.98.1       update  Starting installation of new version.
2020-11-20T18:39:25+00:00       INFO 192.168.98.1       update  Finalising installation.
2020-11-20T18:39:25+00:00       INFO 192.168.98.1       update  Deleting removed files and folders.
2020-11-20T18:39:26+00:00       INFO 192.168.98.1       update  Cleaning up after installation.
2020-11-20T18:39:26+00:00       INFO 192.168.98.1       update  Update to version 3.9.23-rc+pr.31442 is complete.

Actual result BEFORE applying this Pull Request

See issue #31308 .

Expected result AFTER applying this Pull Request

No PHP error like described in issue #31308 .

Documentation Changes Required

None.

[alikon]

I have tested this item ✅ successfully on d158e60

php 8 rc4

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[laoneo]

I have tested this item ✅ successfully on d158e60

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/31442.}

[richard67]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/31442.}

[HLeithner]

Thanks

[HLeithner]

thanks phil